CN112566876B - Display device - Google Patents
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- CN112566876B CN112566876B CN201980053110.5A CN201980053110A CN112566876B CN 112566876 B CN112566876 B CN 112566876B CN 201980053110 A CN201980053110 A CN 201980053110A CN 112566876 B CN112566876 B CN 112566876B
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- display device
- cover glass
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- display
- glass plate
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- 238000011282 treatment Methods 0.000 description 9
- 238000007655 standard test method Methods 0.000 description 7
- 230000004313 glare Effects 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
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- 239000005329 float glass Substances 0.000 description 5
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- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
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- UTPYTEWRMXITIN-YDWXAUTNSA-N 1-methyl-3-[(e)-[(3e)-3-(methylcarbamothioylhydrazinylidene)butan-2-ylidene]amino]thiourea Chemical compound CNC(=S)N\N=C(/C)\C(\C)=N\NC(=S)NC UTPYTEWRMXITIN-YDWXAUTNSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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- 238000005816 glass manufacturing process Methods 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000006060 molten glass Substances 0.000 description 1
- 239000002121 nanofiber Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 229910021426 porous silicon Inorganic materials 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
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- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- -1 silver ions Chemical class 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
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- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
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- 238000009423 ventilation Methods 0.000 description 1
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
- G02F1/133331—Cover glasses
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C15/00—Surface treatment of glass, not in the form of fibres or filaments, by etching
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/06—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for producing matt surfaces, e.g. on plastic materials, on glass
Abstract
The invention relates to a display device (10) comprising a display element (20) having a display surface (7) and a cover glass plate (30) having a first textured surface (1), the display device being configured such that the first textured surface (1) faces the display element. The first textured surface (1) has a surface roughness defined by a first arithmetic amplitude Ra1 (Ra 1. Gtoreq.0.12 μm) equal to or greater than 0.12 μm and a first spacing value Rsm1 (Rsm 1. Gtoreq.45 μm) equal to or greater than 45 μm, both measured over an evaluation length of 12mm using a Gaussian filter having a cut-off wavelength of 0.8 mm. The first textured surface is in direct contact with the display surface over at least a portion of a contact area of the first textured surface.
Description
1. Technical field
The present invention relates to a display device that provides excellent newton ring prevention characteristics.
2. Background art
Touch display applications and digital signal applications typically include display elements separated from a cover glass plate by an air gap. This air gap generally helps to prevent the cover glass plate from contacting the display element and improves ventilation.
In recent years, the size of display devices has increased. The current average size is about 65 inches and future average sizes of displays are expected to reach 75 inches and even larger. Furthermore, there is a market demand for reducing the total weight of display devices. One of the factors is the thickness of the cover glass sheet, which should be kept as small as possible.
Increasing the size of the cover glass sheet causes technical problems in providing cover glass sheets with higher flexibility. Indeed, for similar finger pressure, the glass buckling in the center of the cover glass sheet is proportional to the square of the glass length. Maintaining a minimum thickness of the cover glass sheet also contributes to the flexibility of the glass. Thus, the chance of such cover glass sheets touching the display element is indeed significantly increased. First, friction between the cover glass plate and the display element mechanically damages the surface of the display element. Secondly, when the cover glass plate is pressed by a user's finger, newton rings are generated around the contact portion when the cover glass plate is brought into contact with the display element.
One solution provided in the art to avoid newton rings is to increase the air gap between the display element and the cover glass plate. However, increasing the air gap increases the parallax phenomenon, whereby the displacement or difference in the viewing positions of objects viewed along two different lines of sight increases. Another solution is to adhere the cover glass plate to the display element, thereby avoiding parallax. However, this solution is very expensive, difficult to handle, and does not allow deconstructing and reconstruction in case of failure of the display device.
US 2013/0008767 solves the technical problems of newton rings and glare phenomena known as glare in touch panel applications, and provides an anti-newton ring sheet having an uneven layer that is substantially formed of a polymer resin by arranging a plurality of structures having peaks in a lattice shape.
US 2016/0221315 solves the technical problems of anti-blocking, anti-newton ring and obtaining a clear image by providing a laminated film for a touch panel device. US 2016/0221315 teaches the use of a laminate comprising a substrate, a refractive index adjusting layer on a first surface of the substrate, a transparent conductive layer on the opposite surface, and a fine relief structure layer on a second surface, the fine relief structure layer having an average spacing between protrusions of 400nm or less.
JP 2012252038 discloses an optical film which can improve antiglare properties or newton ring properties and can display a clear image without whitening. Such an optical film includes a transparent film and a hard coat layer formed on the transparent film, wherein an uneven structure is formed on a surface of the hard coat layer, an average interval Sm of the uneven structure between peaks of the protrusions is in a range of 600 μm to 1500 μm and an arithmetic average roughness Ra is 0.04 μm to 0.2 μm. The hard coat layer is formed by curing a composition comprising a curable resin precursor and cellulose nanofibers of a specific diameter and length.
There is a need to provide a cost-effective and efficient solution to design display devices, in particular large-sized display devices, which provide anti-newton ring characteristics.
3. Summary of the invention
The present invention relates to a display device comprising a display element having a display surface and a cover glass plate having a first textured surface, the display device being configured such that the first textured surface faces the display element. The first textured surface has a surface roughness defined by a first arithmetic amplitude Ra1 (Ra 1. Gtoreq.0.12 μm) equal to or greater than 0.12 μm and a first spacing value Rsm1 (Rsm 1. Gtoreq.45 μm) equal to or greater than 45 μm, both measured over an evaluation length of 12mm using a Gaussian filter having a cutoff wavelength of 0.8 mm. The first textured surface is in direct contact with the display surface over at least a portion of a contact area of the first textured surface.
Other aspects and advantages of the embodiments will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the described embodiments.
4. Description of the drawings
Fig. 1 shows a cross-sectional view of a prior art display device comprising device elements and a cover glass plate.
Fig. 2 shows a cross-sectional view of a display device comprising device elements and a cover glass plate according to an embodiment of the invention.
5. Detailed description of the preferred embodiments
An object of the present invention is to provide a display device including a display element and a cover glass plate, which exhibits excellent newton ring-preventing characteristics, particularly when designed in a large size.
Accordingly, the present invention relates to a display device comprising a display element having a display surface and a cover glass plate having a first textured surface, the display device being configured such that the first textured surface faces the display element. The first textured surface of the cover glass plate has a surface roughness defined by a first arithmetic amplitude Ra1 (Ra 1. Gtoreq.0.12 μm) equal to or greater than 0.12 μm and a first spacing value Rsm1 (Rsm 1. Gtoreq.45 μm) equal to or greater than 45 μm, both of which are measured over an evaluation length of 12mm using a Gaussian filter having a cutoff wavelength of 0.8 mm. The first textured surface is in direct contact with the display surface over at least a portion of the contact area of the first textured surface.
Indeed, it has surprisingly been found that by texturing the inner surface of the glass sheet of the present invention to provide a surface roughness defined by a first arithmetic amplitude Ra1 equal to or greater than 0.12 μm (Ra 1. Gtoreq.0.12 μm) and a first spacing value Rsm1 equal to or greater than 45 μm (Rsm 1. Gtoreq.45 μm), such textured inner surface of the cover glass sheet can be brought into direct contact with the surface of the display element without creating Newton rings and without mechanically damaging the surface of the display element.
The cover glass plate has a first textured surface (1) and a second surface (2), which may also be further textured. In the display device of the invention, the first textured surface faces the display element and may therefore also be referred to as inner surface. The second surface faces the outside of the display device and may also be referred to as an outer surface. The second outer surface of the cover glass sheet is spaced from the first inner surface by the thickness of the cover.
Fig. 1 shows a prior art display device (10) in which a cover glass plate (30) is typically separated from a display element (20) by a spacer (3) defining an air gap (4) and protected by a protective frame (5).
Fig. 2 shows a display device according to the invention, wherein the first textured surface (1) of the cover glass plate (30) is in direct contact with the display surface (7) of the display element (20) without any spacers and is protected by a protective frame (5).
An infrared touch sensor (6) may be used and located between the cover glass plate and the protective frame.
The display element has a display surface that may be smooth (i.e., not textured) and thus has a surface roughness defined by an arithmetic amplitude Ra0 equal to or less than 0.2nm (Ra 0. Ltoreq.0.2 nm).
In another embodiment, the display element has a display surface that may be textured and thus have a surface roughness defined by the display arithmetic amplitude Rad and the first pitch value Rsmd.
In a preferred embodiment, the direct contact between the first textured surface of the cover glass plate and the display surface of the display element is such that the average distance Dav between the first textured surface of the cover glass plate and the display surface over the contact area is equal to or less than the sum of the first arithmetic amplitude Ra1 and the display arithmetic amplitude Rad (dav+.times.ra 1+rad)).
The glass cover plate extends over a length L measured parallel to the longitudinal axis X and over a width W measured parallel to the transverse axis Y (perpendicular to X). In a preferred embodiment, the contact area portion is equal to or greater than 50%, preferably equal to or greater than 80%, more preferably equal to or greater than 90%, even more preferably equal to or greater than 100% of the surface of the glass cover plate projected onto a plane parallel to X and Y. In embodiments where the size of the cover glass plate is larger than the size of the display element, the contact area portion may indeed be larger than 100%, preferably equal to or larger than or equal to 110%.
The cover glass plate of the display device of the present invention has a first surface facing the display element. The first face is textured to exhibit a surface roughness defined by a first arithmetic amplitude Ra1 (Ra 1. Gtoreq.0.12 μm) equal to or greater than 0.12 μm and a first spacing value Rsm1 (Rsm 1. Gtoreq.45 μm) equal to or greater than 45 μm, both measured over an evaluation length of 12mm using a Gaussian filter having a cutoff wavelength of 0.8 mm.
In a preferred embodiment, the first arithmetic magnitude Ra1 is comprised in the range 0.12 μm.ltoreq.Ra1.ltoreq.0.5 μm, preferably in the range 0.12 μm.ltoreq.Ra1.ltoreq.0.25 μm, more preferably in the range 0.15 μm.ltoreq.Ra1.ltoreq.0.25 μm. In a preferred embodiment, the first spacing value Rsm1 is comprised in the range 45 μm.ltoreq.Rsm1.ltoreq.200 μm, preferably in the range 45 μm.ltoreq.Rsm1.ltoreq.100 μm, more preferably in the range 50 μm.ltoreq.Rsm1.ltoreq.100 μm.
The second surface of the cover glass plate used in the display device of the present invention faces the outside of the display device. The second surface may be further textured to provide anti-glare and anti-haze properties.
In a preferred embodiment, the surface roughness of the second textured surface has a second arithmetic magnitude Ra2 equal to or greater than 0.08 μm (Ra 2. Gtoreq.0.08 μm) and a second spacing value Rsm2 equal to or greater than 45 μm (Rsm 2. Gtoreq.45 μm), both measured over an evaluation length of 12mm using a Gaussian filter having a cut-off wavelength of 0.8 mm.
In another preferred embodiment, the arithmetic magnitude Ra2 is comprised in the range 0.08 μm.ltoreq.Ra2.ltoreq.0.5 μm, preferably in the range 0.08 μm.ltoreq.Ra2.ltoreq.0.25 μm, more preferably in the range 0.09 μm.ltoreq.Ra2.ltoreq.0.25 μm. In a further preferred embodiment, the second pitch value Rsm2 is comprised in the range 45 μm.ltoreq.Rsm2.ltoreq.200 μm, preferably in the range 45 μm.ltoreq.Rsm2.ltoreq.100 μm, more preferably in the range 50 μm.ltoreq.Rsm2.ltoreq.100 μm.
Glare treats reflected external sources off of a surface, such as bright sunlight or high ambient lighting conditions. The antiglare properties were measured by gloss optical properties. The anti-glare properties use a diffusion mechanism (such as texturing) to break down reflected light off the surface. The gloss characterizes the brightness or shine of the surface, and more particularly corresponds to the specular reflectivity of the surface relative to a standard (e.g., an certified black glass standard). Gloss is measured at a specific angle of 60 ° according to ASTM standard D523-14"Standard Test Method for Specular Gloss [ standard test method for specular gloss ]" date 2017, 5, 4, and it is expressed in SGU (standard gloss units). According to an advantageous embodiment of the invention, the second surface of the cover glass sheet has a 60 ° gloss value from 50SGU to 120 SGU. More preferably, the glass sheet has a 60 ° gloss value from 60SGU to 110 SGU.
Light passing through the glass sheet may be affected by irregularities and surface roughness of the glass sheet, causing light to scatter in different directions. The degree of light scattering depends on the size and number of irregularities present and the surface roughness. Light scattering is responsible for the transmission haze due to the loss of transmission contrast. The diffusion mechanism achieved by, for example, texturing negatively affects the light reflection. Standard test method ASTM D1003-11 defines haze as the percentage of transmitted light that is scattered such that the direction of the transmitted light deviates from the direction of the incident light beam by an angle exceeding 2.5.
In designing cover glass sheets for display applications, both haze and glare properties should indeed be considered to improve or optimize the readability of the displayed image or character set. Thus, there is a tradeoff between reducing glare from the surface and reducing haze from the surface, as increasing the texture/roughness of the glass surface generally results in an undesirable reduction in glare, but an undesirable increase in haze. Texturing the second surface of the glass cover to have such arithmetic magnitudes and spacing values has been found to provide excellent anti-haze and anti-glare properties.
For display applications, it is preferred that the cover glass plate provide low total transmitted haze. Thus, in a preferred embodiment, the total transmitted haze, i.e. the haze of the cover glass plate where the first surface is textured and eventually the second surface is further textured, is preferably equal to or less than 10% (Hazetot. Ltoreq.10%), preferably equal to or less than 8% (Hazetot. Ltoreq.8%), more preferably equal to or less than 5% (Hazetot. Ltoreq.5%). Haze measurements were made according to ASTM standard D1003-11"Standard Test Method for Haze and Luminous Transmittance of Transparent Plastics [ standard test method for haze and light transmittance of clear plastics ]", date 11, 2011, using light source a, according to procedure a implemented by a haze meter. Please refer to paragraph 7 of this standard test method.
Texturing glass surfaces is widely used in the display industry. Texturing may be produced by several known methods, like (i) removal of material from a smooth glass surface by chemical etching or sand blasting or (ii) application of a roughened coating on a smooth surface by, for example, spraying, polymer mesh coating or dip coating.
According to the invention, both surfaces of the cover glass sheet are textured. By "etched surface" is meant a surface that has been mechanically or chemically etched, removed a certain amount of glass material, and imparted with a specific surface texture/roughness. We talk about chemically etching glass when material removal occurs by chemical reaction/attack (i.e., acid etching). We talk about mechanically etched glass when material removal occurs by mechanical reaction/erosion (i.e., sandblasting).
According to the present invention, the textured surface may advantageously be textured over substantially the entire glass surface, i.e. over at least 90% of the glass surface.
The textured surface of a glass plate is generally characterized by its surface texture or roughness and, in particular, by Ra and Rsm values (expressed in microns) as defined in standard ISO 4287-1997. Texture/roughness is the result of the presence of surface irregularities/patterns. These irregularities consist of ridges called "peaks" and valleys called "valleys". In a cross-section perpendicular to the textured surface, these peaks and valleys are distributed on both sides of a "centerline" (algebraic mean), also known as the "bisector". In the profile and for measurements along a fixed length (called "evaluation length"):
ra (amplitude) corresponds to the average difference of the textures, meaning the arithmetic average of the absolute values of the differences between these peaks and valleys. Ra measures the distance between the average and the "line" and gives an indication of the height of the pattern on the textured surface;
rsm (pitch value) is the average distance between two consecutive channels of the profile through the "bisector"; and this gives the average distance between these "peaks" and thus the average value of the width of the pattern.
Roughness values according to the invention can be measured with a profilometer using a 2D profile (according to ISO4287 standard). Alternatively, 3D profilometry techniques (according to the ISO 25178 standard) may be used, but a 2D profile is isolated, which 2D profile then allows to obtain the parameters defined in the ISO4287 standard.
According to the invention, the roughness value is measured with a gaussian filter, which is a filter of long wavelength, also called profile filter ac. It is used to separate the roughness/texture component from the relief component of the profile.
The evaluation length L according to the invention is the contour length for evaluating the roughness. The base length l is the portion of the evaluation length that identifies the irregularities that characterize the contour to be evaluated. The evaluation length L is divided/cut into n base lengths L, depending on the contour irregularities. The base length l corresponds to the "cut-off" wavelength (or limiting wavelength) of the gaussian filter (l=λc). Typically, the evaluation length is at least five times the base length.
In roughness measurements, short wavelength filters (contour filters λs) are also typically used to eliminate the effect of very short wavelengths being background noise.
The cover glass plate according to the present invention is made of glass, the matrix composition of which is not particularly limited and thus may belong to different categories. The glass may be soda lime silicate glass, aluminosilicate glass, alkali-free glass, borosilicate glass, or the like. Preferably, the glass sheet of the present invention is made of soda lime glass or aluminosilicate glass.
According to an embodiment of the invention, the glass sheet has a composition comprising the following in a content expressed as a percentage of the total weight of the glass:
in a preferred manner, the glass sheet has a composition comprising, in a content expressed as a percentage of the total weight of the glass:
in a more preferred manner, the glass sheet has a composition comprising, in a content expressed as a percentage of the total weight of the glass:
such a soda-lime base glass composition has the advantage of being inexpensive, even if it is inherently mechanically less tolerant.
Desirably, according to this last embodiment, the glass composition does not contain B 2 O 3 (meaning that it is not intentionally added but may be present as a very low amount of undesired impurities).
In an alternative more preferred manner, the glass sheet has a composition comprising the following at a content expressed as a percentage of the total weight of the glass:
this aluminosilicate-type base glass composition has the advantage of being mechanically more resistant, but it is more expensive than the soda-lime type.
Desirably, according to this last embodiment, the glass composition does not contain B 2 O 3 (meaning that it is not intentionally added but may be present as a very low amount of undesired impurities).
According to an advantageous embodiment of the invention, which can be combined with the previous embodiments with respect to the base glass composition, the glass sheet has a composition comprising total iron (in Fe in the range of from 0.002 to 0.06 wt.% 2 O 3 Indicated) content. Less than or equal to 0.06wt% total iron (as Fe 2 O 3 In the form of (c) content enables glass sheets to be obtained that have little visible coloration and allow high flexibility in aesthetic design (e.g., do not deform when white screen printing of some glass elements of a smartphone is performed). This minimum value makes it possible to avoid excessive damage to the cost of the glass, since such low iron values often require expensive, very pure starting materials and also purification of these materials. Preferably, the composition comprises total iron (in Fe 2 O 3 In the form of (c) content. More preferably, the composition comprises total iron (in Fe 2 O 3 In the form of (c) content. In the most preferred embodiment, the composition comprises total iron (in Fe 2 O 3 In the form of (c) content.
According to another embodiment of the invention, and with respect to Fe 2 O 3 The preceding embodiments can be combined in amounts such that the glass has a composition comprising, expressed as a percentage of the total weight of the glass, e.g., 0.0001% Cr 2 O 3 Chromium content less than or equal to 0.06%. Preferably, the glass has a glass composition comprising a glass composition in, for example: cr is 0.002 percent or less 2 O 3 Chromium content less than or equal to 0.06 percent. This chromium content allows to obtain a glass with a higher IR transmittance and it is therefore such that when using optical IR touch techniques like for example flatIt is advantageous when using the glass plate in a touch panel for surface scattering detection (PSD) or Frustrated Total Internal Reflection (FTIR) (or any other technique requiring high IR radiation transmittance) in order to detect the position of one or more objects (e.g. fingers or a stylus) on the surface of the glass plate.
The glass sheet of the present invention may be a drawn glass sheet or a float glass sheet. According to an embodiment, the glass sheet of the present invention is a float glass sheet. The term "float glass sheet" is understood to mean a sheet of glass formed by a float process that includes pouring molten glass onto a bath of molten tin under reducing conditions. Float glass sheets include a "tin face" in a known manner, i.e., a face that is rich in tin within the glass body proximate to the surface of the sheet. The term "tin-rich" is understood to mean an increase in the concentration of tin relative to the composition of the glass at the core, which may or may not be substantially zero (no tin). Thus, float glass sheets can be readily distinguished from sheets obtained by other glass manufacturing processes, in particular by tin oxide content, which can be measured, for example, by electronic microprobe to a depth of about 10 microns.
The glass sheet according to the invention may have a thickness of from 0.1mm to 25 mm. Advantageously, the glass sheet according to the invention may preferably have a thickness of from 0.1mm to 6 mm. More preferably, the cover glass plate according to the invention has a thickness of from 0.1mm to 2.1mm for weight reasons.
The cover glass sheet according to the invention may advantageously be prestressed glass. The prestressed glass refers to heat-strengthened glass, heat-toughened glass or chemically-strengthened glass. Heat-strengthened glass is heat treated using controlled heating and cooling methods that subject the glass surface to compression and the glass core to tension. The heat treatment method provides glass with a bending strength greater than that of annealed glass but less than that of thermally toughened safety glass.
The thermally toughened safety glass is heat treated using controlled heating and cooling methods that subject the glass surface to compression and the glass core to tension. Such stresses can cause the glass to break into small granular particles when impacted, rather than breaking into saw-tooth-like pieces. The granular particles are less likely to injure occupants or damage objects.
Chemical strengthening of glass articles is heat-induced ion exchange involving the replacement of smaller alkaline sodium ions in the surface layer of the glass with larger ions (e.g., alkaline potassium ions). Increased surface compressive stress occurs in the glass when larger ions "wedge" into small sites originally occupied by sodium ions. Such chemical treatments are typically performed by immersing the glass in an ion exchange molten bath containing molten salts of one or more larger ions under precise control of temperature and time. Also known are product families of aluminosilicate Glass compositions such as those from Asahi Glass CoOr the product series from Corning Inc. (Corning Inc.)>Those of (c) are very efficient for chemical tempering.
Various layers/treatments may be deposited/carried out on the cover glass sheet of the present invention, on one or both sides of the cover glass sheet, depending on the desired application, intended use and/or characteristics.
According to one embodiment of the invention, the glass plate is coated with at least one transparent and electrically conductive thin layer. The transparent and electrically conductive thin layer according to the invention may be based on SnO, for example 2 :F、SnO 2 Layers of Sb or ITO (indium tin oxide), znO: al or also ZnO: ga.
According to another embodiment of the invention, the glass plate is coated with at least one anti-reflection layer. Advantageously, according to this embodiment, the cover glass plate is coated with said anti-reflection layer on the second surface. This embodiment is advantageous in case the glass plate of the present invention is used as a front cover of a screen. The anti-reflection layer according to the invention may for example be a layer based on porous silicon with a low refractive index or it may consist of several layers (stacks), in particular a stack of layers with alternating layers of dielectric materials with low and high refractive index and ending in a layer with a low refractive index.
According to yet another embodiment, the glass sheet has at least one anti-fingerprint layer/treatment to reduce or prevent the recording of fingerprints. Advantageously, according to this embodiment, the glass sheet has said anti-fingerprint layer/treatment on the second surface. Such layers/treatments may be combined with transparent and conductive thin layers deposited on opposite sides. Such layers/treatments may be combined with an anti-reflective layer deposited on the same side.
According to yet another embodiment of the invention, the glass sheet has an antimicrobial layer/treatment. Advantageously, according to this embodiment, the glass plate has said antimicrobial layer/treatment on the second surface. For example, such an antimicrobial treatment may be silver ions diffusing in the bulk of the glass sheet to near the outer surface.
Embodiments of the present invention will now be further described, by way of example only, along with some comparative examples that are not in accordance with the present invention. The following examples are provided for illustrative purposes and are not intended to limit the scope of the invention.
Example
Gloss measurements were made by BYK's glossmeteter-Micro-Tri Gloss at a specific angle of 60℃according to ASTM standard D523. The surface roughness measurements were performed using a 3D optical profiler Leica type DCM3D using "Leica map" software with a gaussian filter with a cut-off wavelength of 0.8mm over an evaluation length of 12 mm. The sample is first washed with detergent and dried. It is then placed under a microscope and after conventional setup, the profile of the 2D acquisition is then started (the software applies a default cut-off wavelength of 2.5 microns λs). The haze was measured on the cover glass plate by standard test method ATSM D1003 using light source A. Note that the haze value measured by the ATSM D1003 is the same regardless of which surface of the cover glass plate is illuminated in the haze meter.
The exemplary cover glass sheets of examples 1-3 were sodium-calcium compositions made from the following compositions in weight percent:
| SiO2 | 73.27％ |
| Na 2 O | 13.9％ |
| CaO | 7.9％ |
| MgO | 4.5％ |
| K 2 O | 0.07％ |
| Al 2 O 3 | 0.1％ |
| SO3 | 0.2％ |
| TiO 2 | 0.06％ |
examples 1 and 2
The display device was designed with the cover glass plates of examples 1 and 2 below, wherein the first textured surface was in direct contact with the display surface of the display element. The first surface of the cover glass sheet has been textured as described in the following table and positioned in direct contact with the display surface of the display element without creating newton's rings. Such cover glass sheets further provide excellent gloss and haze characteristics.
Example 3
The display device was designed with the cover glass plate of example 3 below, wherein the first textured surface was in direct contact with the display surface of the display element. The cover glass plate was prepared by coupling a VRD VCLO 110 soda lime etched glass as a first inner surface of the cover glass plate to a VRD VCLO 90 soda lime etched glass as a second outer surface of the cover glass plate by immersion of a refractive index liquid (Immersion Liquid Index) from Cargill, inc. The VRD VCLO 90 and VRD VCLO 110 are Glass sheets commercially available from European Glass corporation (AGC Glass Europe).
The first surface of the cover glass plate is positioned in direct contact with the display surface of the display element without creating Newton rings. Such cover glass sheets further provide excellent gloss and anti-haze characteristics.
| Reference sign # | Features (e.g. a character) |
| 10 | Display device |
| 20 | Display element |
| 30 | Cover glass plate |
| 1 | First surface of cover glass plate |
| 2 | Second surface of cover glass plate |
| 3 | Spacing piece |
| 4 | Air gap |
| 5 | Protective frame |
| 6 | Infrared touch sensor |
| 7 | Display surface |
Claims (19)
1. A display device (10) comprising a display element (20) having a display surface (7) and a cover glass plate (30) having a first textured surface (1), the display device being configured such that the first textured surface (1) faces the display element,
wherein the first textured surface (1) has a surface roughness defined by a first arithmetic amplitude Ra1 equal to or greater than 0.12 μm and a first spacing value Rsm1 equal to or greater than 45 μm, namely Ra 1. Gtoreq.0.12 μm and Rsm 1. Gtoreq.45 μm, both measured over an evaluation length of 12mm using a Gaussian filter with a cut-off wavelength of 0.8mm,
wherein the first textured surface is in direct contact with the display surface over at least a portion of the contact area of the first textured surface,
wherein the display surface is textured to exhibit a surface roughness defined by a display arithmetic amplitude Rad, and wherein the direct contact is such that an average distance Dav between the first textured surface of the cover glass plate and the display surface over the contact area is less than or equal to a sum of the first arithmetic amplitude Ra1 and the display arithmetic amplitude Rad, i.e., dav+.1+Rad.
2. The display device of claim 1, wherein the first arithmetic magnitude Ra1 of the cover glass sheet is included in a range of 0.12 μm +.ra 1 +.0.5 μm.
3. The display device of claim 1, wherein the first arithmetic magnitude Ra1 of the cover glass sheet is included in a range of 0.12 μm +.ra 1 +.0.25 μm.
4. The display device of claim 1, wherein the first arithmetic magnitude Ra1 of the cover glass sheet is included in a range of 0.15 μm +.ra 1 +.0.25 μm.
5. The display device of any one of the preceding claims, wherein the cover glass plate has a second textured surface exhibiting a surface roughness defined by a second arithmetic amplitude Ra2 equal to or greater than 0.08 μιη and a second spacing value Rsm2 equal to or greater than 45 μιη, namely Ra2 ≡0.08 μιη and Rsm2 ≡45 μιη, both measured over an evaluation length of 12mm using a gaussian filter with a cut-off wavelength of 0.8 mm.
6. The display device of claim 1, wherein the second arithmetic magnitude Ra2 of the cover glass plate is included in a range of 0.08 μm +.ra 2 +.0.5 μm.
7. The display device of claim 1, wherein the second arithmetic magnitude Ra2 of the cover glass sheet is included in a range of 0.08 μm ∈ra2 ∈0.25 μm.
8. The display device of claim 1, wherein the second arithmetic magnitude Ra2 of the cover glass plate is included in a range of 0.09 μm ∈ra2 ∈0.25 μm.
9. The display device according to claim 1, wherein the first pitch value Rsm1 of the cover glass sheet is comprised in the range of 45 μm ∈1 ∈200 μm.
10. The display device according to claim 1, wherein the first pitch value Rsm1 of the cover glass sheet is comprised in the range 45 μm ∈1 ∈100 μm.
11. The display device according to claim 1, wherein the first pitch value Rsm1 of the cover glass sheet is comprised in the range of 50 μm ∈1 ∈100 μm.
12. The display device according to claim 1, wherein the second pitch value Rsm2 of the cover glass plate is comprised in the range of 45 μm ∈2 ∈200 μm.
13. The display device according to claim 1, wherein the second pitch value Rsm2 of the cover glass plate is comprised in the range of 45 μm ∈2 ∈100 μm.
14. The display device according to claim 1, wherein the second pitch value Rsm2 of the cover glass plate is comprised in the range of 50 μm ∈2 ∈100 μm.
15. The display device of claim 5, wherein the second textured surface has a 60 ° gloss value in the range of 50SGU to 120 SGU.
16. The display device of claim 5, wherein the second textured surface has a 60 ° gloss value in the range of 60SGU to 110 SGU.
17. The display device of claim 1, wherein the cover glass sheet has a total transmission haze value Hazetot equal to or less than 10%.
18. The display device of claim 1, wherein the cover glass sheet has a total transmission haze value Hazetot equal to or less than 8%.
19. The display device of claim 1, wherein the cover glass sheet has a total transmission haze value Hazetot equal to or less than 5%.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP18188012.1 | 2018-08-08 | ||
| EP18188012 | 2018-08-08 | ||
| PCT/EP2019/071227 WO2020030697A1 (en) | 2018-08-08 | 2019-08-07 | Display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112566876A CN112566876A (en) | 2021-03-26 |
| CN112566876B true CN112566876B (en) | 2024-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980053110.5A Active CN112566876B (en) | 2018-08-08 | 2019-08-07 | Display device |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US11314114B2 (en) |
| EP (1) | EP3833643B1 (en) |
| JP (1) | JP2021533414A (en) |
| KR (1) | KR20210041591A (en) |
| CN (1) | CN112566876B (en) |
| WO (1) | WO2020030697A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110922070B (en) * | 2019-12-26 | 2023-10-31 | 凯盛信息显示材料(池州)有限公司 | Glass cover plate and manufacturing process thereof |
| CN114415425A (en) * | 2022-02-16 | 2022-04-29 | 深圳市瀚达美电子有限公司 | Vehicle-mounted backlight module without middle frame |
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2019
- 2019-08-07 EP EP19748834.9A patent/EP3833643B1/en active Active
- 2019-08-07 WO PCT/EP2019/071227 patent/WO2020030697A1/en unknown
- 2019-08-07 CN CN201980053110.5A patent/CN112566876B/en active Active
- 2019-08-07 JP JP2021506555A patent/JP2021533414A/en active Pending
- 2019-08-07 US US17/265,849 patent/US11314114B2/en active Active
- 2019-08-07 KR KR1020217006512A patent/KR20210041591A/en not_active Application Discontinuation
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Also Published As
| Publication number | Publication date |
|---|---|
| US11314114B2 (en) | 2022-04-26 |
| EP3833643A1 (en) | 2021-06-16 |
| US20210294147A1 (en) | 2021-09-23 |
| WO2020030697A1 (en) | 2020-02-13 |
| JP2021533414A (en) | 2021-12-02 |
| EP3833643B1 (en) | 2023-07-12 |
| KR20210041591A (en) | 2021-04-15 |
| CN112566876A (en) | 2021-03-26 |
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